"With Russia relying heavily on rail infrastructure for the transport of troops, equipment, and supplies, the capture of Kupiansk has significant ramifications for the Russian war effort further east.
Ukraine’s capture of the city, a major railway hub, cuts off Russian rail access not only to Izium, but to large portions of the frontline in the Donbas, as far south as Sievierodonetsk.
Most reports remain unconfirmed, but there are many hints that the collapse of Russian defenses in the area is quickly spreading beyond Kharkiv Oblast to the Donbas, the region in Ukraine’s east that has seen the heaviest fighting of the war."
http://kyivindependent.com/national/kupiansk-izium-liberated-as-russian-defenses-collapse-amid-rapid-ukrainian-advance-in-kharkiv-oblast
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